石岛湾东北侧水道对环境影响的数值模拟

Numerical Simulation for Environmental Effects by a Canal in the Northeast of the Shidao Bay

随着经济的发展,石岛湾的环境污染日趋严重。为了改善其海洋生态环境,并增加航运能力,开挖入海通道是非常必要的。通过对石岛湾海水交换率、海水半更新期的估计,以及湾内示踪物浓度分布的数值模拟,研究了开挖多种入海通道的预案,模拟结果显示:石岛湾东北部开挖宽300m或500m水道方案的水体交换效果不及开挖宽800m的方案,后者可明显降低海湾东部的示踪物浓度,有利于湾内的水交换。而开挖的水道宽度增至1000m或1500m后也不会再更加明显地改善石岛湾的水环境,说明可选择开挖宽800m水道的方案。

The environmental pollution becomes more and more serious with the economical development in the Shidao Bay. Therefore it is necessary to construct a canal from the bay to the open sea in order to improve the marine ecological environment in the bay and to raise the shipping ability in the bay. Various plans for the canal construction were studied by means of the estimations of the water exchange rate and the half period for water renewal, and numerical simulations of the tracer concentration distribution in the bay. It is discovered that a 800 m wide canal in the northeast of the bay is better than a 300 m wide or a 500 m wide one for the water exchange and the decrease of the tracer concentration in the east of the bay. The marine environment can not be better improved even if the canal becomes 1 000 m or 1 500 m wide.